GB 20052-2006 The minimum allowable values of energy efficiency and the evaluating values of energy conservatioin for three-phase distribution transformers
This national standard specifies the minimum allowable value of energy efficiency, the targeted minimum allowable value of energy efficiency, the evaluating values of energy conservation and test method for three-phase distribution transformers.
This standard is applicable to off-circuit tap-changing oil-immersed distribution transformer with 30 kVA~1600 kVA rated capacity and dry-type distribution transformer with 30 kVA~2500 kVA rated capacity, which are both three-phase 10 kV.
This standard is not applicable to gas-filled transformer.